Description
Si Huang San (Four Yellows Powder), from TCM External Medicine (Zhong Yi Wai Ke Xue).
Actions: Clear heat and resolve toxins and invigorate blood. Indicated for the treatment of sores and ulcers with yang pattern, accompanied by local red swelling and hot pain, red tongue, and rapid pulse
Indications: It is not suitable for patients with local ulceration
Source: Xi S, Gong Y. Essentials of Chinese Materia Medica and Medical Formulas: New Century Traditional Chinese Medicine. Academic Press/Elsevier, 2017, pp. 861–873.
Composition
| Herb | Amount | % | Role | Function |
|---|---|---|---|---|
|
Huang Lian
as printed: Rhizoma Coptidis (huang lian) 30 g
|
30g | 16.67% | — | |
|
Huang Bai
as printed: Cortex Phellodendri Chinensis (huang bai) 30 g
|
30g | 16.67% | — | |
|
Huang Qin
as printed: Radix Scutellariae (huang qin) 30 g
|
30g | 16.67% | — | |
|
Da Huang
as printed: Radix et Rhizoma Rhei (da huang) 30 g
|
30g | 16.67% | — | |
|
Ru Xiang
as printed: Olibanum (ru xiang) 30 g
|
30g | 16.67% | — | |
|
Mo Yao
as printed: Myrrha (mo yao) 30 g
|
30g | 16.67% | — |
Energetics dose-weighted
The formula's overall nature, taste balance and channel reach, weighted by each herb's dose. Classical formulas often pair warm and cool herbs on purpose, so a net figure summarises the mix — it doesn't describe every herb in it.
Nature
Net cool (-1.17)
From 100% of the weighed grams.
Grams by band: cold 67%, neutral 17%, warm 17%.
Taste
- pungent 17%
- bitter 83%
From 100% of the weighed grams.
Channels reached
- Spleen 83%
- Large intestine 67%
- Heart 67%
- Liver 67%
- Stomach 50%
- Gallbladder 33%
Share of the grams entering each channel, from 100% of the weighed grams.
Dose-weighted from each herb's recorded nature, taste and channels (missing values are left out, never counted as neutral). It describes the composition — it is not a recommendation.
Preparation
Grind the ingredients into fine powder, use appropriate amount, and mix evenly with water or honeysuckle flower distillate, then apply on the sores; or mix evenly with Vaseline into oil paste according to the proportion of 1:4 and then apply
Relationships
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Formula family
Each entry reads as the larger formula written out: “+” adds its other catalogue cores, then the herbs none of them hold. A catalogue formula counts as a core only when at least 80% of its herbs are present, no more than 1 is absent, and the absent herb is not its chief.
Formula Network
Formulas that share herbs with this one — the closer to the centre, the stronger the match. Click a node to explore.
Similar Formulas by composition
Match score combines dosage-weighted composition (cosine, 70%) with shared-herb overlap (Jaccard, 30%).
Traditional formula information is for educational purposes only. Herbal formulas should be prescribed by a qualified practitioner — dosages and combinations are individualized and can interact with medications.
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